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Add lightness option to modulate operation

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This commit is contained in:
Tenpi
2021-08-16 22:50:17 -04:00
committed by Lovell Fuller
parent 104464c2e0
commit 4a9267ce12
10 changed files with 62 additions and 13 deletions
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7
src/operations.cc
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@@ -182,7 +182,8 @@ namespace sharp {
0.0, 0.0, 0.0, 1.0));
}
VImage Modulate(VImage image, double const brightness, double const saturation, int const hue) {
VImage Modulate(VImage image, double const brightness, double const saturation,
int const hue, double const lightness) {
if (HasAlpha(image)) {
// Separate alpha channel
VImage alpha = image[image.bands() - 1];
@@ -190,7 +191,7 @@ namespace sharp {
.colourspace(VIPS_INTERPRETATION_LCH)
.linear(
{ brightness, saturation, 1},
{ 0.0, 0.0, static_cast<double>(hue) }
{ lightness, 0.0, static_cast<double>(hue) }
)
.colourspace(VIPS_INTERPRETATION_sRGB)
.bandjoin(alpha);
@@ -199,7 +200,7 @@ namespace sharp {
.colourspace(VIPS_INTERPRETATION_LCH)
.linear(
{ brightness, saturation, 1 },
{ 0.0, 0.0, static_cast<double>(hue) }
{ lightness, 0.0, static_cast<double>(hue) }
)
.colourspace(VIPS_INTERPRETATION_sRGB);
}